Photographic camera.



G. VOGT & G. DIETZ.

PHOTOGRAPHIG CAMERA.

APPLICATION FILED MAE. 2, 1908.

926,912. Patented July 6, 1909.

M itnesses:

64M. Wzim MGM ough of the Bronx,

New York, and GUSTAV GUSTAV VOGT, Ol

PHOTOGRAPHIC CAMERA.

To all whom it may concern:

Be it known that we, GUSTAV VoGT, a citizen of the United States, residing in the borin the cityand State of DIETZ, a citizen .of the United States, residing in Yonkers, in the county of \Vestchester, in. the State of New York aforesaid, have'invented a certain new and useful Improvement in. Photographic Cameras, of which the following is a specification.

The improvement relates to provisions for focusing.

e have discovered'improved means for attaining the desired mechanical connection of the finder with the lensboard. It has long been attempted to make the focusing automatic by provisions for determining .the angle subtended by afainiliar object as a man or a horse at the required distance. -We adopt that general mode of operating.

. The following is a description of what we consider the best means-of carrying out the invention.

The accompanying drawings form a part of this specification.

Figure 1 is a side elevation partly in longitudinal section on a line'1-1 in Fig. 2 and Fig. 2 is an end elevation partly in cross section on the line 2-.2 in Fig. 1.

Similar letters of reference indicate like parts in both the figures.

A, is a camera of an ordinary construction. B, the sliding adjustable portion which carries the objective lens and C, the bellows, all of which and the other parts not fully described, may be of an ordinary and long approved character.

D, is a knob on the end of a shaft D which extends across the camera and operates by a spur-wheel D which engages with a rack B on the under side of the slide B. By turning this the lensboard may be moved and the focus may be changed as little or much as re- (mired in either direction.

E is a concave lens which may be: of the size and quality ordinarily used for the finder except that it is graduated with horizontal lines 6 spaced unequally. These lines are nearer together at the mid-height. The spaces increase above and below as will presently be explained. This lens is mounted in the frame E hinged to the camera at E so that it can fold down when not required for use.

r Specification of Letters Patent. Application filed March'2, 1908.

' man, the animal,

UNITED OFFICE.

NEW YORK, AND (ilIS'lAV DIETZ, ()1

ASSIG-NOR. TO SAID VOGT.

YONKERSNEW YORL; SAID DIETZ T Patented July 6,1909.

. Seria1-No L418,876.

\ G-is an eye-piece or sight, a light-bar of metal provided with a sight hole 9- nearits l upperend and hinged to the top of the camera at a proper distance from the finderiE. This sight isadapted to fold toward'the finder and is connected therewith by a link H properly knuckled to each so that. pressing the finder rearward will fold down both the finder and the-sight. When these par-tsaro folded downthe'part G-lies underneath and the'part E lies over'it. The two, with the link which. connects them, occupy small, flat, space on the top of the camera.

It has beenlong knownand practiced in mately by means of the varying angle at which an object is presented in the field of view. 'For our purpose we can use a man, a horse-or, in the case of ordinary dwellings, a window, all these being sufficiently near auniform height of 5-01" 6 feet toserve our purpose. The lines e are carefully placed on the ens E at such distance a artgraduated according to well understoo laws of optics that either of'these objects viewed through the sight orifice 9 will indicate by its matching to the several lines, what the distance is, of the or the window. "The oper ator will be able, by means of this invention ment ra idly and with approximate correctness, serving the object through this indicating device,the' peculiarly graduated lens, and next with the information thus-obtained adjusting the focus of his instrumentby the ordinary means,a separate operation, quicker than the ordinary and wit less menta labor but still requiring some of the latter.

We have added to the above a further improvement to which-we attach special -importance; a mechanical connection of the sliding part B with the two indices so arranged that when the operator turns the knob Din the direction to slide the objective B- outward the two indices will be correspondingly ator turns the knob D in the direction to draw the objective inward, the indices will correspondingly move toward each other. As the invention is carried outin these figures K is a slender cord of silk or other strong and sufiiciently flexible material. One end is secured adjustably in a s ool carried on the slide B and operated by and, clamped by a other arts to determine distances approxiso far as yet described, to focus his lDSt-lU-I but a moved apart-and Whentheoper- .is drawn in and put out labor required of the operator is small.

milled-headed'nut M applying on a screw IJ- 7 use. The precise amount of tension exerted The cord K extends therefrom under a pulley by the spring R is not of much importance. P'mounted on a stationary portion of the f Risk of errors from the stretch of the cord is camera. From this pulley it extends upward l slight but we have provided for an adjustand is attached to the lowermost index J. ment of the mechanical connection. All From this index it extends up over a pulley that is necessary to increase the distance Q above the finder and thence downward and apart of the indices I and J for all positions of is attached to the uppermost index-I. From the objective, is to take up the length of the this the cord further extends downward and j cord K by slackening the nut M and winding is maintained in an extended condition by a gentle. tensile spring R. When the objective part M and tightening the nut again.

of use, the indioes We claim as our invention:

may move quite together, the spring R urg- 1. The combination of a lensboard, a con,-

ing the index I downward and the index J cave finder, movable indexes on the finder, and a connection of the movable indexes upward. But'whenever the instrument is brought into condition for use, the movewith the lcnsboard, this connection being adment of the objective outward acting through justed so that ifthe known object as a man the connecting cord K, raises the index I and (no matter what distance away) is kept belowers the index J always to an equal extent tween the two indexes on the finder by the and always just corresponding to the extent movement of the lensboard and lens, the lens to which the objective is moved outward. is set to pro er focus for the object.

Itwill beseen that the care and intellectual 2. In a photographic camera a movable The lensboard and means for operating it, a finder lens suitably mounted and hinged in combination with two parallel indices carried thereon adapted for being moved apart and together to indicate the angle of a known object and a mechanical connection of these parts adapted to insure a correspondence of two indices I and J mayhave much extension horizontally as shown and the window or animal or other object, preferably a man in erect i position when such is available, may be brought by the proper adjustment into the space between the indices, and will indicate l whether the distance is 10 feet, 50 feet or adjustment and to allow of folding, commore. We will now call attention to what bined and arranged to serve as herein speciwe esteem far more important. The inven- I lied. tion will insure that the objective is in the. l 3. In a photographic camera a movable correct position for producing a clear and l lensboa'rd and movable indices all connected sharp image at the distance whatever it may i by a flexible cord in combination. with a be. All that is necessaryis to open the cam-j finder lens mounted in a frame hinged for era including the raising of the finder E and folding and arranged to carry the indices as to look through the eye piece G at the field, herein specified. to turn the knob D or by Cher means move 1 4. In a photographic camera a movable the lensboard until the indices I and J come lensboard and movable indices connected in line of sight with the head and foot of a therewith by a flexible cord, in combination man or horse which may chance to be at the with a spool and clamp nut adapted to'allow distance required and make the exposure. the connecting cord to be adjusted at will as The graduations e are not essential, still less herein specified; important are the figures engraved 01' other- 5. In a photographic camera a finder lens wise produced near them. Judgment will be foldably attached in combination with a required in the operator to allow for a diilersight-bar hinged and. arranged to be folded ence when the window or other object which under the finder, and a link connected to is depended on to give the focal length reeach, all adapted to serve, substantially as quired, is more distant from or nearer to the herein specified. eye than the principalobjects which it is de- Signed at New York, New York this 11 sired to depict. day of February 1908. I

The thickness of the cord may be varied but it is important that the cord be flexible so that it can effect the movements of the indices apart and together with exactness and allow the finder and its accompanying parts to be folded down when the camera is out of GUSTAV VOG GUSTAV DIETZ.

Witnesses:

AL. H. GRAHA M,

l I I l ARTHUR P. M ARR.

up a sufficient length of cord by turning the 

